Set of two books. - Book Title: Biographies of Great Scientists - Content: Explanations of scientists' discoveries and achievements Manga History of Scientific Inventions and Discoveries Tsunezo Murotani Kumon Publishing - Book Title: Stories of Inventions and Discoveries in Numbers and Figures - Content: Historical explanations of mathematics and shapes From Pythagoras to Electronic Computers Edited by Kiyonobu Itakura Kokudosha There are stains on the top and folds on the cover. Please understand that these books have been stored at home.